The United States and Russia are set to face off over nuclear weapons in space on Wednesday at the United Nations Security Council, which is due to vote on a U.S.-drafted resolution calling on countries to prevent an arms race in outer space. Russia is expected to block the draft resolution, said some diplomats. The U.S. move comes after it accused Moscow of developing an anti-satellite nuclear weapon to put in space, an allegation that Russia's defense minister has flatly denied. Read this story